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x86: simplify ljmp to 32-bit code

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You can directly specify the label as the operand for ljmp.

This commit saves 4-byte code.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fixed the gas warning]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Masahiro Yamada 2019-12-03 14:28:58 +09:00 committed by Bin Meng
parent 0d915a9aa4
commit 90ab311a7c
1 changed files with 1 additions and 3 deletions
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4
arch/x86/cpu/start16.S
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@ -44,10 +44,8 @@ data32 cs lgdt gdt_ptr
ff:
/* Finally restore BIST and jump to the 32-bit initialization code */
movw $code32start, %ax
movw %ax, %bp
movl %ecx, %eax
data32 cs ljmp *(%bp)
data32 cs ljmp *code32start
/* 48-bit far pointer */
code32start: